Apparatus for stretching skins and leather



14 1927. June M. JONES APPARATUS FOR STRETCHING SKINS AND LEATHER Filed April 9. 1925 2 Sheets-Sheet 1 I. JONES APPARATUS FOR-STRETGHING'SKINS AND LEATHER June 14, 1927.

Filed April 9, 1925 2 Sheets-Sheet 2 'IIIIIIIIIIIII l Rift uma une14,;1927.

m nswear-muss; or"iiinwiruxnn;wisodixrsimnssrenoniro eienrsecfisimm 1 l AN EWALD" 'KQRNYITZ," HQ I M A E sc tsii l Application: filed A ni 9 1925; Serial m. T 21,830. 3

5 V This invention hasas a general object'the simplification land lightening of apparatus 5 cost of production. F

Anotherfobject of this invention resides 'the rovisioill Of an apparatus for: stretching and; drying Skins, leather and 'other 'ma-f ten-ails havinga plurality of atta hinggsur n; facesa-rrangedffor movement inw'a} common plane, drwingtreperatifigmember-and connections between the driving and operat 'ing member. for eifec'ting'simultaneous movement between the attaching surfaces.v

further obj ect of this invention resides 'jirithe 'proyisi'ongof means permitting rotatijo'nal; movement' of the: attaching members fityherby the distribution of stresses on the skin,i -1eather; or] Pothei" material being With the above and other-objects in view 'WhichiWill" appearasthedescription pro- CBBdSyIIIyIHVBIItiOII resides in the novel cOnstruction combination and arrangement of) and moreparticularly definedby the ap pended elaims 'it' being understood that i "such changes in the precise embodimentof Figure 1 isalyiew partly in section and partlyvin ele vation'yof an improved frame constructed in} accordance with my invention, a skin orfother-f material being'illu s- :tratedin dotted lines HSattZLChGdZthBI'GtO;

. I Figure 2 isa; fragmentary {sectional View 1 taken through Figure l on-the pl'ane f the line2" 2;" A I v w l 1 the manner of mounting the outer "end of theactuating shaft I 1.5 F'gure 4: is a fragmentary sectional View LA LWABAT SF S E QHINGSKiNs Annnnarfinm tional vienrtaken-through Figure 5 on the l 'accompanying drawings in; which dike nib merals .deslgnate llke parts throughout the constructed of angle iron and reinforced at smegma c1 isautomaticallyequalized; v I p I or guide rods 8' is a cross-head on which partssubstantially as hereinafter described ete "exampies of the I to p r Figure'3fisa fragmentary deteilView of y anfirontelevational VieW of a sshghtlymod fiedform ofmy iny'entio'n; -=F 1gure-6=1sian enlarged fragmentary sec? V .;t10nal-v1eW takenthroughFigmre-nthe' wh -Maths line t -tre d I Figure 7- is a fragmentary detail sec plane of the line 7 -7.:

Referring now more particularly the several views, the-numeral 5 designates a rectangular supporting v frame preferably its corners by corner piecesor castings 6" and posltionedqcentrally of the. frame 5 is a :Cfl'SllHg or housing 7' which" is mounted in place bypairs of braceyrods S IproViding guides for the members" 9; to -be later dej scrlbedf The brace or gu de rods 8 are arranged in pairs and {have their inner; ends "threaded in "the" central casting or housing H asgat- .941; and their' outer ends suitably secured in thecorner members 6. '**2 ,Sli'dably; mountedon each pair'fof brace the frame members 9 are rotatably mounted, each cross-head being preferably in the form "of a casting or other construction having two I parallel guide openlngs 11 therein through whichits supporting braceor guide rods-8 slide. Each frame memberfi is preferably constructed from angle iron 12 and, in the 'present embodiment, is of rectangular shape frame being covered with 2ifOYLIIllIlOLlS member 13 which providesan attaching sur 7 face. i

p rovide an inwardly: projecting flange '16 which engages. E in, an annular channel or groove 17 formed between the extended 7 periph m l oxedgeportion 1 8 of a clampingpl'ate '19 and the *adj acent cross ihead 10, theclampp The movement-of the frames 9 is scoordihated by a driving 'oroperating1member :2l "rotatably mounted in thefcastlng" or hous mg 7 by a-pivot b0lt$ 22= and adaptedto'be :ro-

' ith'the inner-most corner cut away, the

.in v late .19 b'eingremovably" secured to the cross-headgbyboltsor other means .20. Th s arrangement firmly mounts each frame :9 {1n 10o 1 the-frame 5 for moyelnentfradially. ofthe v casting or housing 7 and permits; its :I'Otit w t'? t, the *anis ofthe cros s hejad, atthe sametimefretains the framesm; 1 a common planeat'alltimes;

" tated bya anactuating shaft 23; the inner II end of which is threaded in an internally threaded sleeve 24 eccentrically fixed to the driving or operating member by a pivot bolt 25. The outer end of the shaft 23 is rotatably, but non-longitudinally shiftably, supported from one side angle member of the frame 5 by a socket member 26 splined thereto,as at 27, and journaled in a socket bearing 28 suspended from the adjacent frame side. The outer end of the shaft 23 is squared, as at 29, for convenience in applying an actuating crank thereto and, as will be readily apparent, rotation of the shaft to screw the inner end thereof in the sleeve 24 tends to rotate the driving or operating member 21 in a clockwise direction with respect to Figure 1 and a rotation of the shaft in a reverse direction tends to rotate the member 21 in a counter-clockwise direction.

The rotational movement of the driving or operating member 21 is transmitted to the frames 9 by connecting members or toggle links 30, the inner ends of which are eccentrically, pivotally connected with the member 21 by crank pins 31 carried thereby to one side of its axis and the outer ends of the links are pivotallyconnected, as at 32, to the cross-heads 10. One of the members 30 has its inner end eccentrically connected with the driving or operating member 21 by the pivot securing the threaded sleeve 24 thereto.

In. operation the skin, leather or other material to be stretched, designated 33, is attaehed to the apparatus by hooks 01' other members 3a which are engaged with the edges of the material and in the apertures 01 the attaching surface. Shaft 23 is then rotated to thread its inner end into the sleeve 24 rotating the operating or driving member '21 in a clockwise direction with respect to Figure 1 causing the members to move the frames 9 outwardly toward their positions illustrated in Figure 1, stretching the material as will be readily apparent. Should the operator in placing material 83 on the frame dispose unequal strains thereon, the members 9 independently rotate about the cross-heads 10 to equalize the strains as will be readily apparent.

In-that form of my inventionillustrated in Figures 5, 6 and 7, the construction is identical with that illustrated in Figures 1 t0 4, inclusive, except that the frames 9 are held against rotation and the construction thus materially simplified and lightened. The frames.9 in this form. of my invention are slidablv mounted on the guide rods 8 by slides fixed to the opposite ends of-the frame 9 which slidably engage therods. The

toggle links 30 for engaging thedrivingor operating member-.=with thef ram es 9 have their outer, ends ,pivotally connected with the inner-most: slide members,.as at 36, and the operating shaft 23-. is connected .with -the member 21 by a beveled gear 37 fixed to its inner end and meshed with a bevel gear 38 fixed to the member 21. The inner end of the shaft 23 in this form of my invention is journaled in a bearing 39 formed on the pivot pin 22 of the member 21 and the outer end of the shaft 23 is journaled in a bearing 40 suspended from the adjacent side of the frame 5.

The operation of this form of my inven tion is identical with that form illustrated in Figure 1 with the exception that the frames 9 are held against rotational movement and, therefore, a further detail description thereof is deemed unnecessary.

hat I claim as my invention is:

1. An apparatus of the character described, comprising a plurality of approximately rectangular frame members having their innermost corner portions cut away and provided with work engaging surfaces, means mounting the frame members for movement in a common plane, an operating member, means rotatably n'iounting the operating member medially of the frame members, connecting members having their inner ends eccentrically connected with the operating member and their outer ends connected with the frame members, whereby rotation of the operating member moves the frame members in a common plane, and means operable from one side of the apparatus for rotating the operating member.

2. An apparatus of the character described, comprising a main supporting frame structure, guide members extending across the frame structure, a plurality of frame members guided in the main frame structure for movement in a common plane by the guide members, said frame members having work engaging surfaces, and means for producing relative movement between the frame members.

3. In an apparatus for stretching skins and leather, comprising a main supporting frame structure, guide members mounted in the frame structure and radiating from the center thereof, a plurality of frame members guided for movement in the main frame in a common plane by the guide members, an operating member mounted in the main frame structure between the frame members, and connections between the operating member and the frame members, whereby actuation of the operating member moves the frame members in a common plane.

4. An apparatus of the character described, comprising a main supporting frame structure, guide members mounted in the frame structure and radiating from the center thereof, a plurality of frame members guidedfor movement in the main frame in ture between the frame members, an operating member journaled in the housing, and connectln membershaving their inner ends eccentrica lly secured to the operating member and their outer ends connected with the frame members, whereby rotation fof the operating member moves the framemem- 'bers on the guide members.

' n 5. In an apparatus for stretching skins and leather, comprising a plurality of frame members having 'vvork engaglng surfaces, means mountlng the frame members for movementvonly in a common plane and perm tt ng rotat on thereof on an axis transgverselyoftheplane of-movement, an operating member mounted medially of the frame members, means connecting the oper- 2o of'in a common plane.

ating members with the frame members, and means for driving the' operating member whereby its motion is transmitted to the frame members to produce movement. there 6. In an apparatus frame structure,guide members mounted in the frame structure and radiating fromthe center thereof, a plurality of frame members guided for movement in the main frame n a common plane by the guide members,

guides mountedin the main frame structure, cross-heads 'slidably mounted in the" main frame structure by the guides, frame a members [having Workengaging surfaces,

means mounting aframe member on each cross-head, an actuating member mounted between the frame members, and meansconnectmg the actuating memberwith the crossheadsyvvhereby operation of the actuating members causes movement of the frame members on a common plane.

7. An apparatusxof the character de scribed, comprisinga main supporting frame structure, guidemembers mounted in the p for stretching skins V and leather, comprising amain supporting guide means radiallyextended from the hub frame structure and radiating from the center thereof, a plurality of frameinembers guided for movement in the main frame in a common plane by the guide members, guides mounted in the main frame structure, cross-heads slidably mounted in the members having work'rengaging surfaces,

"main frame structure ,by the guides, frame r I means mountinga frame member on each cross-headfor rotation on an ax s transf verselyrof the guides, anactuating member mountedibetween the frame members, and

means connecting the actuating member with the cross-heads, whereby operationiof the actuating member causes movement" of,

the frame members on a common planel l 8. In an apparatus for stretching skins and leather, comprising .a plurality of frame means mounting the framemembers for versely of the plane of movement, and

means for producing movement of the frame members on a common plane.

*9. In an apparatus for stretching skins and leather, comprising a hub member,

member, a plurality of frame members-havwhereby actuation of the operating member -moves the frame "members in a common plane.

imembers having workyengaging surfaces, I

movement only in a common plane and perfmitting rotation thereof on an axis trans-j ing 'Work engaging surfaces guided byithefl In testimony whereof I aflix mysignar ture. 1

IRA MILTONJONESI 

